import {
  document,
	window,
	HTMLCanvasElement,
	requestAnimationFrame,
  cancelAnimationFrame,
  URL,
  Blob,
core,
	Event,
  Event0
} from "dhtml-weixin"
import * as THREE from './three/Three';
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
import { OrbitControls0 } from 'three/addons/controls/OrbitControls0.js';
import { STLExporter } from 'three/addons/exporters/STLExporter.js';
import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
var requestId
Page({
  onShareAppMessage(){
    return getApp().onShare()
  },
  onShareTimeline(){
     return {title:"ThreeX 2.0"}
  },
	onUnload() {
		cancelAnimationFrame(requestId, this.canvas)
		this.worker && this.worker.terminate()
if(this.canvas) this.canvas = null
		setTimeout(() => {
			if (this.renderer instanceof THREE.WebGLRenderer) {
				this.renderer.dispose()
				this.renderer.forceContextLoss()
				this.renderer.context = null
				this.renderer.domElement = null
				this.renderer = null
			}
		}, 0)
	},
  webgl_touch(e){
		const web_e = (window.platform=="devtools"?Event:Event0).fix(e)
		this.canvas.dispatchEvent(web_e)
  },
  onLoad() {
		document.createElementAsync("canvas", "webgl2").then(canvas => {
      this.canvas = canvas
      this.body_load(canvas).then()
    })
  },
  async body_load(canvas3d) {
    

			let scene, camera, renderer, exporter, mesh;

			const params = {
				exportASCII: exportASCII,
				exportBinary: exportBinary
			};

			init();
			animate();

			function init() {

				camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.1, 100 );
				camera.position.set( 4, 2, 4 );

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xa0a0a0 );
				scene.fog = new THREE.Fog( 0xa0a0a0, 4, 20 );

				exporter = new STLExporter();

				//

				const hemiLight = new THREE.HemisphereLight( 0xffffff, 0x444444, 3 );
				hemiLight.position.set( 0, 20, 0 );
				scene.add( hemiLight );

				const directionalLight = new THREE.DirectionalLight( 0xffffff, 3 );
				directionalLight.position.set( 0, 20, 10 );
				directionalLight.castShadow = true;
				directionalLight.shadow.camera.top = 2;
				directionalLight.shadow.camera.bottom = - 2;
				directionalLight.shadow.camera.left = - 2;
				directionalLight.shadow.camera.right = 2;
				scene.add( directionalLight );

				// ground

				const ground = new THREE.Mesh( new THREE.PlaneGeometry( 40, 40 ), new THREE.MeshPhongMaterial( { color: 0xbbbbbb, depthWrite: false } ) );
				ground.rotation.x = - Math.PI / 2;
				ground.receiveShadow = true;
				scene.add( ground );

				const grid = new THREE.GridHelper( 40, 20, 0x000000, 0x000000 );
				grid.material.opacity = 0.2;
				grid.material.transparent = true;
				scene.add( grid );

				// export mesh

				const geometry = new THREE.BoxGeometry();
				const material = new THREE.MeshPhongMaterial( { color: 0x00ff00 } );

				mesh = new THREE.Mesh( geometry, material );
				mesh.castShadow = true;
				mesh.position.y = 0.5;
				scene.add( mesh );

				//

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.shadowMap.enabled = true;
				document.body.appendChild( renderer.domElement );

				//

				const controls = new (window.platform=="devtools"?OrbitControls:OrbitControls0)( camera, renderer.domElement );
				controls.target.set( 0, 0.5, 0 );
				controls.update();

				//

				window.addEventListener( 'resize', onWindowResize );

				const gui = new GUI();

				gui.add( params, 'exportASCII' ).name( 'Export STL (ASCII)' );
				gui.add( params, 'exportBinary' ).name( 'Export STL (Binary)' );
				gui.open();

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function animate() {

				requestId = requestAnimationFrame( animate );
				renderer.render( scene, camera );

			}

			function exportASCII() {

				const result = exporter.parse( mesh );
				saveString( result, 'box.stl' );

			}

			function exportBinary() {

				const result = exporter.parse( mesh, { binary: true } );
				saveArrayBuffer( result, 'box.stl' );

			}

			const link = document.createElement( 'a' );
			link.style.display = 'none';
			document.body.appendChild( link );

			function save( blob, filename ) {

				link.href = URL.createObjectURL( blob );
				link.download = filename;
				link.click();

			}

			function saveString( text, filename ) {

				save( new Blob( [ text ], { type: 'text/plain' } ), filename );

			}

			function saveArrayBuffer( buffer, filename ) {

				save( new Blob( [ buffer ], { type: 'application/octet-stream' } ), filename );

			}

  }
})